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Manuelarossiite, CaPbAlF7, a new fluoride from the Vesuvius volcano, Italy

Published online by Cambridge University Press:  11 November 2024

Fabrizio Nestola Open the ORCID record for Fabrizio Nestola [Opens in a new window] ,
Anatoly V. Kasatkin Open the ORCID record for Anatoly V. Kasatkin [Opens in a new window] ,
Cristian Biagioni Open the ORCID record for Cristian Biagioni [Opens in a new window] ,
Vladislav V. Gurzhiy Open the ORCID record for Vladislav V. Gurzhiy [Opens in a new window] ,
Radek Škoda ,
Lisa Santello Open the ORCID record for Lisa Santello [Opens in a new window]  and
Atali A. Agakhanov
Fabrizio Nestola*
Affiliation:
Dipartimento di Geoscienze, Università di Padova, Via Gradenigo 6, I-35131, Padova, Italy
Anatoly V. Kasatkin
Affiliation:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Leninsky Prospekt 18-2, 119071 Moscow, Russia
Cristian Biagioni
Affiliation:
Dipartimento di Scienze della Terra, Università di Pisa, Via Santa Maria, 53, I-56126 Pisa, Italy
Vladislav V. Gurzhiy
Affiliation:
Department of Crystallography, Institute of Earth Sciences, St. Petersburg State University, University Emb. 7/9, 199034 Saint-Petersburg, Russia
Radek Škoda
Affiliation:
Department of Geological Sciences, Faculty of Science, Masaryk University, Kotlářská 2, 611 37, Brno, Czech Republic
Lisa Santello
Affiliation:
Dipartimento di Geoscienze, Università di Padova, Via Gradenigo 6, I-35131, Padova, Italy
Atali A. Agakhanov
Affiliation:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Leninsky Prospekt 18-2, 119071 Moscow, Russia
*
Corresponding author: Fabrizio Nestola; Email: [email protected]Associate Editor: Elena Zhitova
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Abstract

Manuelarossiite, ideally CaPbAlF7, is a new fluoride mineral found in a specimen from a fumarole formed subsequent to the 1944 eruption of the Vesuvius volcano, Naples Province, Campania, Italy. It occurs as very rare tabular crystals, up to 0.06 × 0.04 × 0.015 mm, in the vugs of volcanic scoria, associated with cerussite. In the same scoria where manuelarossiite was found, anglesite, artroeite, atacamite, calcioaravaipaite, cerussite, challacolloite, cotunnite, hephaistosite, matlockite, napoliite and susannite were identified. Manuelarossiite is colourless with a white streak and adamantine lustre. It is brittle and has a laminated fracture. Cleavage is perfect on {001}. Dcalc = 5.095 g cm–3. The calculated mean refractive index is 1.625. The chemical composition (wt.%, electron microprobe, H2O calculated by stoichiometry) is: CaO 13.98, PbO 55.46, Al2O3 12.59, F 29.45, H2O 1.68, –O=F –12.40, total 100.76. The empirical formula calculated on the basis of 7 anions is Ca1.00Pb1.00Al1.00[F6.25(OH)0.75]Σ7.00. Raman spectroscopy confirms the limited presence of OH– groups in the mineral. Manuelarossiite is monoclinic, space group C2/m, with a = 7.6754(3), b = 7.4443(4), c = 9.2870(5) Å, β = 93.928(5)°, V = 529.39(5) Å3 and Z = 4. The strongest lines of the powder X-ray diffraction pattern [d, Å (I, %) (hkl)] are: 9.257 (57) (001); 4.537 (72) (111); 3.725 (98) (020); 3.630 (57) (20$\bar 1$); 3.588 (65) (11$\bar 2$); 3.460 (100) (021); 3.422 (63) (112); and 2.673 (65) (220). The crystal structure was refined to R1 = 0.056 for 849 reflections with F > 4σ(F). It is characterised by {001} layers formed by CaF8 polyhedra decorated on both sides by AlF6 octahedra, in turn connected to the {001} layer through edge-sharing. Successive {001} layers are bonded through Pb atoms. The new mineral honours Dr. Manuela Rossi (b. 1977) from the University of Naples for her contribution to the study of the Vesuvius volcano and its minerals.

Keywords

manuelarossiitefluorideRaman spectroscopycrystal structure1944 eruptionVesuvius volcanoItaly
Type
Article
Information
Mineralogical Magazine , First View , pp. 1 - 8
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of The Mineralogical Society of the United Kingdom and Ireland.

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